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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76135c360ef636ce0b455303ccf303beec37c1acfdb8a2ff9e05cd6884384158' 
  AND token = 'v+hkv8n2MOQji9FyRipb3zUHl4i0EMl4vI8o9D20yTg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}